Engineering and Technology Journal

Abstract

The alloys used in this study were two types pf stainless steels (304SS and
316 SS) , low alloy steel (Type T22-ASTM) and Inconel 600 alloy `(nickelbase
superalloy). The oxidation mechanism were studied for three steel
alloys and for inconel 600 in liquid Pb-Bi eutectic (LBE) in the temperature
range 450- 550 oC using stagnant test . A model based on the experiments
of Cr oxidation at high temperature with scale vaporization was applied to
the present oxidation process by replacing the vaporization rate with the
mass-transfer-corrosion rate. The results indicate that all steel alloys
showed an oxidation/corrosion behavior. The oxidation kinetics is parabolic
and the corrosion kinetics is linear. The parabolic oxidation rate constant
are of the following order (Kp) 304SS (Kp) 316SS > (Kp) low alloy steel .
The scale-removal-rate constants Kr by mass transfer corrosion are of the
following order (Kr) inconel > (Kr) 316SS > (Kr) 304SS . The weight loss
increases with increasing Ni content in the steel alloys.